See USAC results I believe in 1987 promotors had the option of their USAC race being wing or non-wing.

The World of Outlaws have a brand identity that resembles Hershey in chocolate no one is going to win a war with them on the wing side. See USA Sprint Car series that tried and even lured Sammy, The King, and Wolfgang to run it. It failed and made Ted Johnson and the WoO even stronger.

The All-Stars had shows at Circle City and Kokomo last season. They were so successful that ... wait for it ... they didn't reschedule them this season.

For me personally I like my sprint cars like the ladies, topless.